What type of level gauge is suitable for the anhydride residue evaporator?
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The material inside the tank evaporates, leaving behind residues with high viscosity that tend to stick to the walls. The temperature inside the tank is above 200 degrees, and the negative pressure is -90 kPa. I have used Rosemount’s rope-type level gauges; the material getting caught on the rope prevented an accurate measurement of the liquid level. The overhead magnetic flip-ball float at the site can also get stuck with materials. The crystals at the bottom of the director’s radar aren’t very useful either. What other level gauges can meet such operating conditions?
Phenolic anhydride crystallization is indeed very troublesome. There’s a bold idea: [use an electronic scale, install the evaporator on the scale, and measure the liquid level based on weight]. I’ve seen similar applications.
Theoretically, it works, but adding a scale isn’t possible. Do you think a pneumatic level gauge could work?
Pneumatic level gauges are very useful, and weight measurement devices are also useful; I have used both types, and it’s essential to choose a reputable manufacturer.
Using a waveguide rod. . . . . . Isn’t the phthalic anhydride residue evaporator just a tank for heavy components? What chemicals do you use in the heat treatment process? Can the material be this thick?
The isolated level measurement mode can solve this problem by filling an isolating fluid or gas between the measuring element (pressure or differential pressure transmitter) and the medium. For many challenges in level measurement here, such as measuring the level of residue oil, asphalt, and similar substances, this approach is used, and the results are very satisfactory. The temperature can reach up to 430° ； The lowest pressure is -93 KPA.
The weighing measurement is very accurate, but it is important to ensure that the tank has no external connections at this time; it must be completely suspended, with pressure acting only on the plunger.
Upvote a good post! Thank you to the original poster